Variety lathe



J. J. WITT vAfiIETY LATHE May 6,1930.

Filed Dec. 27, 1927 6 Sheets-Sheet J WITT VARIETY LATHE May 6 1 Filed Dec. 27, 1927 6 Sheets-Sheet 2 eJ w J. J. WITT VARIETY LATHE May 6, 1930.

Filed Bed. 27, 1927 6 Sheets-Sheet s 1 NNN NW 7 y Mandy:

J. J. WITT VARIETY LATHE May 6, 1930.

Filed Dec. 27, 1927 6 Sheets-Sheet 4 May 5,19 0. v J.J.w|TT 1,757,155

VARIETY LATHE Filed Dec. 27, 1927 5 Sheets-Sheet 5 52- /&/ l'l 65 l Jbb I I 6a Patentecl May 6, 1930 UNITE a TATES JOHN, J; wrrw, or wmcnnnbon, MASSACHUSETTS, ASSIGNOR TO ooorosrnnn MACHINE.

COMBAT-1m: VIN E- m i W Q I- F Wa A} Q B B'A PN' 9F M AG SET'TS VARIETY application m maxim ze-1 937.; SeriaINo. 2 423770.

This. invention relatesito a variety lathe used for turning handles, knobs, spindlesgor other similar articles. which are to be: pro;

. duced in largequantities; V It i'sthegeneral-object 0t my invention to improve the construction of such lathes certainimportant respects, to. the end} thatthey may-loemore easily adaptedto. theitoriningot articles of different sizes and contours;

that; the quality: oiitheiworkz produced may be improved,- and thaethe rate, of production mayibeiincreasedif I l/llith general ohjiect; .in view;

portant features of my invention relate: to the provision oi; improved means. for. advancing and retracting the turning tools relative to the work, andto: the provision ofi'improved mechanism for taking a finish cut; overthe articles I My invention further relates to arrange ments and combinations of parts which will be hereinafter set forth and more particular}; ly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in hich- Figfl is a front elevation of my improved 1 lathe 1 in the'di'rectionofthe arrow in Fig,;s-.;, 7

fi h Wi g y 12 h f ii Qnee iii ithe lzhwis a dina chu k .0 F g. L); on; he-wo kh lden 3 an the em -"dime" p anets. a

Fig-.2 isa plan v-ievvthereoii;

Fig. 3' is a detailsectional side elevation, taken substantially along the line 3f3 in Fig.2; 7

, Fig. 4 is a similar View but showing-a different portion of the feed bar ,1 T I Fig, 5 is. a detail sectional elevation, taken along the-lfiineiFig; 3; 1 i Fig. is a seetional end elevationtaken along-th li neQT Ei-Iin Fig.1?

V Fig. 7 isa sectional frc'irifielevation, taken e-ea ITe-' i F .2 I

' Fig. 8 is a sectional end elevation taken ta ge i long 6,1 11% efe ni 1 T;- e a l e-is a. detail front elevation, bo t ng Fig; 11 is enlarged detail sectionalrear 1 ea wtalgt ae Qt I and in Fig; 15.

a L sect'fonal end; er y eg piece of work associated there- With; i

Fig. 13 isv a diagrammatic vieW i-Hustrat ing the relative positions: ot the diiierent turningandcuttingtools; a

Fig. 14 is a; viewsi 'lar to Fig. 8,.but showing the partsin a different position; Fig.; 15 is! a detail View of a partially finished piece of Work;

' Fig. 16 is a side elevation. of acam: plate or templet: tofbe used in producing the Work shown in Fig; 15,, and

i Fig; 171 is a plan View of a. finishing kniiie adapted to finish the article shownincoinplete LI Referring-toethe draWings,.I have shown a lathe comprisinga bed 20 (Fig 1") monnted 'vided with a square shaft 32 extending through the driving spindle 22:. The Work 7 holder v may thus be moved axially along the iirame; 20 while: retaining its". driving-..con- I nection with the spindle 22.

A drive; shaft (Fig 1), is, mounted in hearings in the support's'21and' is driven by abel-13-3.6 and change. pulleys 37'at any desired rate of speed! The shattr35v is connect.-

ed by a small pulley 38 and belt 39 a large pulley 4 0 havingga pinion tlg rotatable there with; 1The; pinion 41 engages alarge gear 42.01 1; a cam-shaft 43 (EigSYG; and-'7)f,andthe upon legs or supports21 and having a orkdriving spindle '22 mounted in bearings in "Q3111: shafitf rotated-fat relatively slow 1 speed."

:clfa' kp -n 63 i. 41 rnq irm 'afbel tightener pul 49.103 whichthevbelt-iifili may.

be: t ghtened; to; the ca shaft in mag tiion when desi'lied;

7' I Greta feecfing mechanism;

suitable guide, to be described, adjacent the turning and cutting tools.

For feeding the work progressively toward the tools, I have provided a cam 51 (Fig. 7 on the camshaft-43,,which engages a cam roll 58 on a feed bar 59 which is slidably mounted in suitable bearings 60 (Fig. 2) and 61 (Fig-3) -form ngpart of. he' r me 2070f the lathe.

" A stop 62 (Fig. limits movementof the feed bar to the left, such movement being caused by a heavy spring 653 securedat one.

end to the frame and at the opposite end to a stud 64 depending from the-feed bar 59. A rack bar 66 is adjustably clampedin a groove 'in the upper face of the feed bar 59 and is provided with notches 67 which may be spaced as desiredto correspond to the length of the work to be produced. a

A pawl 70 (Figro). is mounted on a rock shaft? 1 (Figl'fz) supported in bearings 78 on the cross slide'31. A spring 74 holds the pawl 70yieldinglyin contact with the rack bar 66. An arm 75 (Fig.1) is mounted on the .cross rod 71 and is connected bya link 7 6 to a. hand lever 77 by whichthe'pawl 70 maybe raised, when it is desired. toreturn the cross head to its'initial position adjacent the spindle head '23.

With this construction, as the-cam shaft is sloWlyrotated, the feedbar 59 and rack bar 66 will draw the crosshcad 31 gradually toward the cutting tools, thus feeding the work-1V past the tools. At the end of each stroke, the feed bar willbereturnedlto its'initial position as shown inFig. 3, slipping underthe pawl 70 until'the pawl engages the 7 next notch 67 in the rack bar 66. t The cross head is th'usmoved progressively toward-the cutting toolsuntil the parts reach the posiion'indicated in Fig. 4, in which position there are no further notches 67 to be engaged by the pawl ceases.

, F07 mz'ng tool mechanism,

As theworkis progressively-fed toward the right, it, is centered in a guide plate80 (Figs. 6 and 11)" and is engaged by-a-roughing tool 81 (Fig. 6 "clam-ped-to the side of a -teol hea d-82.- -,The roughing tool-reduces the work to approximately cylindrical shape, so that it"may be fedthrough an opening 83 (Fig. 11) in the center ofthe guide-plate 80.

. The work isnex t'engagedby a forming tool 'cated' under'the dependingprojection of 'the fdrming' tool support, and the forming and the; feed accordingly tool is thus raised and lowered as the work is fed axially under the tool by the action of the feed bar 59. In that way, the work is very quickly and easily brought to approximately the desired shape.

A cam (Fig. 9) on the cam shaft 43 engages acam roll 96 on a lever 97 pivoted at 98 on theframe 20. A link 99 is piv oted at 100 (Fig. 8) on the'tool support 87 at its lower end has a slot. 101 through which extends astud 102 in the lever 97.

As .the cam shaft 43 rotates, the cam 95 causes the support 87 to be periodically raised,

and the support is alternately drawn .down ward by a heavy spring'103 connected thereto. Whenthesupport 87 is raised by the 'cam 95, the tool 85Iis out of engagement with the work and when the support is lowered by the spring 103, its position is, governed by the cam plate scribed. V

I It is at times desirable to'swing the support 87' clear of the machine, for changing the tool 85 or for other-purposes, and on suchoccas sions the support may be swung upward to the 5 position indicated in Fig; 14, the slot 101tper. mitting such upward swinging movement and the pringl 10,3'being'manual1y discon-' neted; J

, M namagateway mam-m i I The apparatus thus far described provides for roughing out the stock and for forming an article of approximately the desired shape,

as indicated inFig. 11. ;I -;have also'p'rovided mechanism of special "design for thereafter taking. a finishingcut and giving the article its exact-finished shapef For this'purpose, I provide a knife 105 (Figs; 2, Sand 10)v jclampejd ina tool: holder 106 (Fig. 10) in which it is secured by binding screws 107. The holder 106 is slidable toward and from the-work in'a' dove-tailed guide-way 108' formed on a stand 109w'hich in turn is rnounted in'a guide-way 110 in-a .frame member 111 eXtendingaxially-of the lathel'f' 'r A link 112 (Fig.8) is pivoted at one end at 113 to the tool holder 106 andat the'opposite end at 114 to an arm 115 extending-upward 1y from a cam lever 116.- "A cam-ro1l117 is mounted on a block 118 which is' adj ustably secured-to the lower end 'of theleve-r 51-16, with the roll 117 positioned in thegsidegroove' 119 of. a cam -119Yon-the-cam shaft 4:3,pre-

The knife 105113.93. width substantially equal to the lengthof the particular, article to be formed and has its cutting edge shaped and contoured to correspond to. the desired outline r,

91 g- 11) aspreviouslyde;

izs

InaFi -iaSi- 1...}... indicated 2' km. i05 adapted to 'finislra'handle W, while in Fig. I 17.1 have indicated a knife105}? shapedrand contoured t6 finish a." knob on ornament W? of the general outline shown in Fig. 17. In Fig. I have shown the article 1V after the operation of the forming knife thereon, and in Fig. 16 I have shown a cam plate 91 which would be used to give the forming knife the necessary transverse movement to produce the article shown in Fig. 15.

' the spring 134. A collar 142 (Figs. 2 and 7 from.

(Figs..8 andlO) which is preferably mounted for len thwise and an ular ad'ustment in a clamping device 121 carried by the tool hold er106. As the finishing knife 105 completes its finishing cut, the cut-off knife 120 enters the work and severs thefinished article there- The relative movements of the guides are clearly indicated in Fig. 13, which shows the forming tool 85 ashaving'completed its work and as having been raised to inoperative position by the cam '95. The finishing knife 105 has also completed its tangential finish, ing out below the work 7' and the cutting off knife 120 has been thereafter advancedito sever thefinished article from the stock WV from which it is produced.

Drilling attachment 7 It is frequently desirable to drill a center hole in the article as it is being formed and for this purpose I have provideda non-rotatable drill spindle'130 (Figs. 1 and 2 slidably mounted in bearings 131'and 132 at the inner end thereof. A spring 134 (Fig. 1) engages a collar 135 on the spindle 130 and acts to yieldingly withdraw the drill from the work.

An arm 138 (Fig. 7) is clamped to the spindle1130 and. extends downward there from. At its lower end it is provided with a cam roll 139 engaged by a barrel cam 140 on the cam shaft 43. The drill is thus advanced periodically against the end of the rapidly rotating work and thus drillsthe required hole therein.

An ejector cam 141-011 the shaft 4.3 acts to force the drill positively out of the work, the retracting movement being completed by is clamped on the spindle 180 and engages'the bearing 132 to limit rearward movement of the drill. V

Operation V V 7 Having thus described my invention, the

operation and advantages thereof will be readily apparent. My improved lathe may be quickly and easily adapted for the rapid production of duplicate work, merely by inserting a suitable cam plate and rack bar in the feed bar 59, and a finishing knife 105 of the desired outline and contour in the holder 106, and makingthe necessary axial and transverse adjustments of the tools and slide. The machine will then operate in a semi-automatic manner, it being merely necessary for the. operator to return the cross slide 31 to its initial position when a given pleceof stock hasbeen used up and to insert a fresh piece of stock inthe machine. The machine will then automatically transform the stock into as manyfinished articles as can be produced therefrom, the feedof the stock automatically'ceasing when the notched bar 66 reaches the position indicated in Fig. 4:.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the detailsherein disclosedotherwise than as set forth in the claims, but what I claim is e 1. .In a variety lathe, a bed, a stock feeding cross head mounted for longitudinal,

movement on said bed, and having a feed bar having a step by step engagement therewith, work forming and finishing tools mounted for successive operation on said stock as'it is fed. longitudinally of the bed, and means to move said cross head and actuate said tools insynchronized relation comprising a .68.]11 shaft havmg cams thereon effective respectively to engage said feed bar to actuate said cross head and to engage said tools, and said feed barhaving acam thereon effective to move said formingtooltoward andfromthe work, the cam on said camshaft'which controls the forming tool shifting said tool toward and from operative position with rela- .tion to the work and with relation to the cam'on said feed bar.

' 2. In a variety lathe, a bed, a stock feeding cross head mounted for longitudinal movement on saidbed, and having a feed bar hav-' ing a step by step engagement'therewith, a

forming tool, and means to movesaid cross head and actuate said tool in synchronized relatlon comprising a camshaft hav ng cams thereon effective respectively to engage said 7 feed bar to actuate said cross head and to en gage said tool, and saidfeed bar having a cam thereon effective to move said forming tool toward and fromthe Work, the cam on tool shifting said tool toward and from operativej position. with relation to the work and with relation tothe cam on said feed bar. i

In testimony whereof I fixed my signature.

have hereunto af- JOHN J. wrrT.

said cam shaft which controls the forming 

